Q. Why does a drum sound?
A. The parchment head of the drum vibrates from the blow of the drum-stick, and sets in motion the sound-waves of the air.
Q. Why do musical glasses give sounds?
A. Because the glasses vibrate as soon as they are struck, and set in motion the sound-waves of the air.
Q. Why do flutes, &c. produce musical sounds?
A. The breath of the performer causes the air in the flute to vibrate, and sets in motion the sound-waves of the air.
Q. Why do piano-fortes produce musical sounds?
A. The keys of the piano (being struck with the finger) lift up a little hammer which knocks against a string; and the vibration thus produced, sets in motion the sound-waves of the air.
Q. Why are some notes bass and some treble?
A. Slow vibrations produce bass or deep sounds; whereas, quick vibrations produce shrill or treble sounds.